Removing the cats.

[saeedakobiakov]

Modified by saeedakobiakov at 10:38 AM 3/14/2010

[mgokool]

Nice!.....would def like to see some pics and clip....

[qship96]

Our children, grand-children, plants and animals all thank you for needlessly adding to the earths pollution, all so you can selfishly enjoy the sound of your exhaust system........

[fiveliterbeater]

Our children, grand-children, plants and animals all thank you for needlessly adding to the earths pollution, all so you can selfishly enjoy the sound of your exhaust system........

nice!

[nmgoodthing]

Our children, grand-children, plants and animals all thank you for needlessly adding to the earths pollution, all so you can selfishly enjoy the sound of your exhaust system........

Go hold hands and sing Kumbaya somewhere else Al Gore.

[saeedakobiakov]

I see you drive prius hypocrite.My wife drives one. so there hope you feel better.

[fiveliterbeater]

you guys have to admit he does kinda have a point.

im all for driving my V8 down the street to get the mail or let my V8 idle in the garage while i go take a shower, but to go and remove the cats and then post on here that the power on the car "may be a little stronger" or " feels like the rpms climb faster" isn't really a worthwhile mod.in other words the benefits of doing it don't outweigh the disadvatages of not doing it.

now if you were to come and post that you gained 50rwhp by removing the cats, then i would'nt be here posting this and i'd be at my local muffler shop polluting the earth right alongside you.

[nmgoodthing]

I'm pretty sure the car on has one set of cats after the headers, all the rest are just resonators for sound reduction.

Your ok caug.

[qship96]

I'm pretty sure the car on has one set of cats after the headers, all the rest are just resonators for sound reduction.

Your ok caug.

Sorry, incorrect- there are "pre-cats" at the exhaust headers to help with cold start emissions, and then the "real" catalytic converters that clean the air during normal vehicle operation......I am quite sure the EPA would disagree with your comment" your OK caug"......even after they fine you the $$10,000 plus for violating a frederal law.....pretty stupid to come on a internet forum and announce you broke federal law when a simple 2 minute search revealed his name, place of employment{ an oriental carpet dealer} and town and phone number- all it takes is one EPA employee to see post and open an investigation, or some environmentalist here to turn you in......

[ken in az]

this thread sucks

[fiveliterbeater]

hey have you taken your car back to the track yet? you need to go soon before those hot desert months kill your times.

[MazDuh]

Sorry, incorrect- there are "pre-cats" at the exhaust headers to help with cold start emissions, and then the "real" catalytic converters that clean the air during normal vehicle operation......I am quite sure the EPA would disagree with your comment" your OK caug"......even after they fine you the $$10,000 plus for violating a frederal law.....pretty stupid to come on a internet forum and announce you broke federal law when a simple 2 minute search revealed his name, place of employment{ an oriental carpet dealer} and town and phone number- all it takes is one EPA employee to see post and open an investigation, or some environmentalist here to turn you in......

Actually, you're incorrect a bit too. the precats are there for catalyst monitoring. The actually do less than you claim as far as reducing bad ju-ju coming from the tailpipe. Oxygen sensors(narrow bands) generate a Sin wave of voltage, with a 1v amplitutde that usually center between .45 and .55v. The catalyst is supposed to reduce the frequency of this wave by 3, I.E. 3peaks per engine monitoring 02 for every 1 cat monitoring 02. Some cars monitor the main catalyst, some cars monitor precats. Generally cheaper cars monitor main catalysts because of the cost of manufacturing precats.

Now I'm all for cars polluting less. but you have to understand how far technology has come. Catalysts were designed for vehicles without EGR, without fuel injection and sans all modern emissions BS, nowadays all these cars have all of those things. Emissions has gotten so crazy that most CAN cars now have a pump to pump air into the gas tank, and a sensor mounted elsewhere on the gastank to check for Evaporative leaks of the tank and vent lines. Remove a catalyst from these modern cars and its still 50x cleaner than an '81 LTD 302 with a cat. I think you should shake your fist at jimmy joe bob down the street with the restored '68 Camaro without cats, You can straight pipe 20+ Y34's and they'd still pollute less than that camaro. Good luck with that though, since he's probably got suspenders, and can sit on you while drinking naty light.

Personally, I have 5 cars i regularly drive, two of them have emissions systems intact, one has no egr due to being a japanese powerplant(cars over there can pollute, its OK there!), one has no cat but has megasquirt and is tuned pretty well that it'll pass a sniffer test without it, and the other is just a lost cause, with no cat, but i drive it about 2000 miles a year.

Go to any car forum, tons of people have no cats, no exhaust, carbed cars that were EFI. Truth be told your efforts to make this world cleaner have not been in vain, you've allowed at least 20 of us to remove the cats from our cars without any significant change Lighten up a bit, its not like he peed on your front door.

-Eric

[caug1]

Eric,Come over i let you drive some time.later man,caug

[qship96]

Actually, you're incorrect a bit too. the precats are there for catalyst monitoring. The actually do less than you claim as far as reducing bad ju-ju coming from the tailpipe. Oxygen sensors(narrow bands) generate a Sin wave of voltage, with a 1v amplitutde that usually center between .45 and .55v. The catalyst is supposed to reduce the frequency of this wave by 3, I.E. 3peaks per engine monitoring 02 for every 1 cat monitoring 02. Some cars monitor the main catalyst, some cars monitor precats. Generally cheaper cars monitor main catalysts because of the cost of manufacturing precats.

Now I'm all for cars polluting less. but you have to understand how far technology has come. Catalysts were designed for vehicles without EGR, without fuel injection and sans all modern emissions BS, nowadays all these cars have all of those things. Emissions has gotten so crazy that most CAN cars now have a pump to pump air into the gas tank, and a sensor mounted elsewhere on the gastank to check for Evaporative leaks of the tank and vent lines. Remove a catalyst from these modern cars and its still 50x cleaner than an '81 LTD 302 with a cat. I think you should shake your fist at jimmy joe bob down the street with the restored '68 Camaro without cats, You can straight pipe 20+ Y34's and they'd still pollute less than that camaro. Good luck with that though, since he's probably got suspenders, and can sit on you while drinking naty light.

Personally, I have 5 cars i regularly drive, two of them have emissions systems intact, one has no egr due to being a japanese powerplant(cars over there can pollute, its OK there!), one has no cat but has megasquirt and is tuned pretty well that it'll pass a sniffer test without it, and the other is just a lost cause, with no cat, but i drive it about 2000 miles a year.

Go to any car forum, tons of people have no cats, no exhaust, carbed cars that were EFI. Truth be told your efforts to make this world cleaner have not been in vain, you've allowed at least 20 of us to remove the cats from our cars without any significant change Lighten up a bit, its not like he peed on your front door.

-Eric

Actually ,you are the one incorrect on the purpose of the pre-cats.....their whole purpose is to reduce emissions faster from a cold start than the regular cats can, as in order for cats to be effective they must become super hot, and the placement of the precats at the exhaust manifolds puts them closer to the engine to heat up and become effective much quicker than the normal cats further away from the engine......simple concept that is known by anyone who takes the time to study and learn the system.

I have not "allowed" anyone to get away with removing their cats as you stated....it is not my job- but I do think it is wreckless to post to the world that you just broke a federal law....you never know who is reading this site, and whether they are half way around the country from you, or in your backyard, and who they are employed by{EPA? state govt? emissions program for your state?} THAT was my point...........

[ken in az]

hey have you taken your car back to the track yet? you need to go soon before those hot desert months kill your times.

I'm thinking of selling my gears - know anyone that wants em? Also thinking of selling the headers too. Going back to semi stock. Need to focus on my 300zx Lq9 swap then start building my sandrail.

oh - an this thread is worse than before - lol

[nmgoodthing]

Quote »Sorry, incorrect- there are "pre-cats" at the exhaust headers to help with cold start emissions, and then the "real" catalytic converters that clean the air during normal vehicle operation......I am quite sure the EPA would disagree with your comment" your OK caug"......even after they fine you the $$10,000 plus for violating a frederal law.....pretty stupid to come on a internet forum and announce you broke federal law when a simple 2 minute search revealed his name, place of employment{ an oriental carpet dealer} and town and phone number- all it takes is one EPA employee to see post and open an investigation, or some environmentalist here to turn you in......[/quote]Thanks Captian America!

LOL! Watch out for dark vans Caug, The internets police are watching.